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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '462fabdee34c1876a78f888f7706eee9f92b2ef1f7f74b27d7c341909a4f4c3d' 
  AND token = 'aLv3V+Bo+6pFiwcN6wvQ3nHy3lqZaun9AyO5iHIjRU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}